对JavascriptindexOf函数使用的简单说明-内江站浩晨众云

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对JavascriptindexOf函数使用的简单说明

使用方法：strObj.indexOf(str,startIndex[可选])

程序代码

其中strObj是必选项。String 对象或文字。
str是必选项。要在 String 对象中查找的子字符串。
startIndex是可选项。该整数值指出在 String 对象内开始查找的位置，从0开始。如果省略，则从字符串的开始处查找。

注意：对于JavaScript indexOf是区分大小写的。

JavaScript中indexOf函数方法返回一个整数值，指出 String 对象内子字符串的开始位置。如果没有找到字符串，则返回 -1。如果 startindex 是负数，则 startindex 被当作零。如果它比***的字符位置索引还大，则它被当作***的可能索引。

javascript indexOf函数是从左向右执行查找

下面的示例说明了indexOf函数方法的用法。

程序代码

 
 
 
  
  
  var str1="fdiejDIFADF";  
  
  
  var str="e";  
  
  
  var i=str1.indexOf(str);  
  
  
  alert(i);

在前面说了，indexOf是区分大小的写，有时这就给我们造成了一定的麻烦，那怎么解决呢？？当然最简单的方法是把字符用toLowerCase或toUpperCase转化为大写或小写就解决了。
代码如下：
程序代码

 
 
 
  
  
  


	    基本
        文件
        流程
        错误
        SQL
        调试
    

		    
    
	请求信息 : 2026-02-17 03:57:53 HTTP/1.1 GET : /article/dhssged.html
运行时间 : 0.0729s ( Load:0.0033s Init:0.0005s Exec:0.0647s Template:0.0043s )
吞吐率 : 13.72req/s
内存开销 : 2,215.61 kb
查询信息 : 12 queries 5 writes 
文件加载 : 36
缓存信息 : 0 gets 2 writes 
配置加载 : 130
会话信息 : SESSION_ID=drvn1s9te45ptmdr1plhjsms62
    
    
        
    
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/home/wwwroot/jxjierui.cn/ThinkPHP/Library/Behavior/ShowPageTraceBehavior.class.php ( 5.24 KB )
    
    
        
    
	[ app_init ] --START--
Run Behavior\BuildLiteBehavior [ RunTime:0.000005s ]
[ app_init ] --END-- [ RunTime:0.000024s ]
[ app_begin ] --START--
Run Behavior\ReadHtmlCacheBehavior [ RunTime:0.000165s ]
[ app_begin ] --END-- [ RunTime:0.000179s ]
[ view_parse ] --START--
[ template_filter ] --START--
Run Behavior\ContentReplaceBehavior [ RunTime:0.000064s ]
[ template_filter ] --END-- [ RunTime:0.000086s ]
Run Behavior\ParseTemplateBehavior [ RunTime:0.003491s ]
[ view_parse ] --END-- [ RunTime:0.003510s ]
[ view_filter ] --START--
Run Behavior\WriteHtmlCacheBehavior [ RunTime:0.000061s ]
[ view_filter ] --END-- [ RunTime:0.000070s ]
[ app_end ] --START--
    
    
        
    
	1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
 [ SQL语句 ] : SELECT `id`,`pid`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1  
1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') LIMIT 1' at line 1
 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( id= ) LIMIT 1  
1064:You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')' at line 1
 [ SQL语句 ] : SELECT `id`,`navname` FROM `cx_nav` WHERE ( pid= ) 
[8] Undefined index: pid /home/wwwroot/jxjierui.cn/App/Home/Controller/ArticleController.class.php 第 47 行.
[2] file_put_contents(./App/Runtime/Temp/0e938f8f30c4610c8626eae273c376f8.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.
[8] Undefined index: db_host /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 120 行.
[8] Undefined index: db_port /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 121 行.
[8] Undefined index: db_name /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Db.class.php 第 122 行.
[2] file_put_contents(./App/Runtime/Temp/0e22128bae6616df3ae0cbb9ab9d4263.php): failed to open stream: Permission denied /home/wwwroot/jxjierui.cn/ThinkPHP/Library/Think/Cache/Driver/File.class.php 第 132 行.
    
    
        
    
	    
    
        
    
	    
    
    



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